Philip Zimbardo was the leader of the notorious 1971 Stanford Prison Experiment — and an expert witness at Abu Ghraib. His book The Lucifer Effect explores the nature of evil; now, in his new work, he studies the nature of heroism.

Philip Zimbardo was the leader of the notorious 1971 Stanford Prison Experiment — and an expert witness at Abu Ghraib. His book The Lucifer Effect explores the nature of evil; now, in his new work, he studies the nature of heroism.